[media] dvb-frontend: Use boottime

Wall time obtained from ktime_get_real is susceptible to sudden jumps due to
user setting the time or due to NTP.  Boot time is constantly increasing time
better suited for comparing two timestamps.

[mchehab@osg.samsung.com: fix trivial merge conflicts]
Signed-off-by: Abhilash Jindal <klock.android@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index 4008064..03cc508 100644 (file)
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -899,10 +899,10 @@ void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec)
        s32 delta;
 
        *waketime = ktime_add_us(*waketime, add_usec);
-       delta = ktime_us_delta(ktime_get_real(), *waketime);
+       delta = ktime_us_delta(ktime_get_boottime(), *waketime);
        if (delta > 2500) {
                msleep((delta - 1500) / 1000);
-               delta = ktime_us_delta(ktime_get_real(), *waketime);
+               delta = ktime_us_delta(ktime_get_boottime(), *waketime);
        }
        if (delta > 0)
                udelay(delta);
@@ -2451,7 +2451,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
                        u8 last = 1;
                        if (dvb_frontend_debug)
                                printk("%s switch command: 0x%04lx\n", __func__, swcmd);
-                       nexttime = ktime_get_real();
+                       nexttime = ktime_get_boottime();
                        if (dvb_frontend_debug)
                                tv[0] = nexttime;
                        /* before sending a command, initialize by sending
@@ -2462,7 +2462,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file,
 
                        for (i = 0; i < 9; i++) {
                                if (dvb_frontend_debug)
-                                       tv[i+1] = ktime_get_real();
+                                       tv[i+1] = ktime_get_boottime();
                                if ((swcmd & 0x01) != last) {
                                        /* set voltage to (last ? 13V : 18V) */
                                        fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18);

diff --git a/drivers/media/dvb-frontends/stv0299.c b/drivers/media/dvb-frontends/stv0299.c
index a817780..c43f36d 100644 (file)
--- a/drivers/media/dvb-frontends/stv0299.c
+++ b/drivers/media/dvb-frontends/stv0299.c
@@ -422,7 +422,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long
        if (debug_legacy_dish_switch)
                printk ("%s switch command: 0x%04lx\n",__func__, cmd);
 
-       nexttime = ktime_get_real();
+       nexttime = ktime_get_boottime();
        if (debug_legacy_dish_switch)
                tv[0] = nexttime;
        stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */
@@ -431,7 +431,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long
 
        for (i=0; i<9; i++) {
                if (debug_legacy_dish_switch)
-                       tv[i+1] = ktime_get_real();
+                       tv[i+1] = ktime_get_boottime();
                if((cmd & 0x01) != last) {
                        /* set voltage to (last ? 13V : 18V) */
                        stv0299_writeregI (state, 0x0c, reg0x0c | (last ? lv_mask : 0x50));